#include "head.h"

int main(int argc, char ** argv)
{
	int sockfd, new_fd;
	struct sockaddr_in	server_addr, client_addr;
	int sin_size, portnumber;
	char hello[2550];
	
	strcpy(hello, "Hello, Are you fine?\n");

	if(argc != 2)
	{
		fprintf(stderr, "Usage:%s portnumber\a\n", argv[0]);
		exit(1);
	}

	if((portnumber=atoi(argv[1])) < 0)
	{	
		fprintf(stderr, "Usage:%s portnumber\a\n", argv[0]);
		exit(1);
	}

	if((sockfd=socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		fprintf(stderr, "Socket error:%s\n\a", strerror(errno));
		exit(1);
	}

	bzero(&server_addr, sizeof(struct sockaddr_in));
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	server_addr.sin_port = htons(portnumber);

	if(bind(sockfd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr)) == -1)
	{
		fprintf(stderr, "Bind error:%s\n\a", strerror(errno));
		exit(1);
	}
	
	if(listen(sockfd,5) == -1)
	{
		fprintf(stderr, "Listen error:%s\n\a", strerror(errno));
		exit(1);
	}


	while(1)
	{
		sin_size = sizeof(struct sockaddr_in);
		if((new_fd=accept(sockfd, (struct sockaddr *)(&client_addr), &sin_size)) == -1)
		{
			fprintf(stderr, "Accept error:%s\n\a", strerror(errno));
			exit(1);
		}

		fprintf(stderr, "Server get connection from %s\n", inet_ntoa(client_addr.sin_addr));
		/*if(write(new_fd, hello, strlen(hello)) == -1)
		{
			fprintf(stderr, "Write error:%s\n\a", strerror(errno));
			exit(1);
		}
*/
/*=================================*/
		read(new_fd, hello, strlen(hello));
		printf("The server receive:%s",hello);
/*=================================*/
		close(new_fd);
	}
	close(sockfd);
	exit(0);
}
